000002083 001__ 2083
000002083 005__ 20200824145831.0
000002083 037__ $$aBELLE2-CONF-PH-2020-005
000002083 041__ $$aeng
000002083 100__ $$aWilliam Sutcliffe
000002083 245__ $$aA calibration of the Belle II hadronic tag-side reconstruction algorithm with $B \rightarrow X\ell \nu$ decays
000002083 260__ $$c2020-05-08
000002083 300__ $$amult. p
000002083 520__ $$aTag-side reconstruction is an important method for reconstructing $B$ meson decays with missing energy. The Belle II tag-side reconstruction algorithm, Full Event Interpretation, relies on a hierarchical reconstruction of $B$ meson decays with multivariate classification employed at each stage of reconstruction. Given the large numbers of classifiers employed and decay chains reconstructed, the performance of the algorithm on data and simulation differs significantly. Here, calibration factors are derived to correct for this effect for the case of hadronic tag-sides using $B\rightarrow X\ell\nu$ decays in $34.6$ fb$^{-1}$ of Belle II data. For a loose selection on the tag-side $B$ multivariate classifier the calibration factors are $0.65 \pm 0.02$ and $0.83 \pm 0.03$ for tag-side $B^{+}$ and $B^{0}$ mesons, respectively.
000002083 6531_ $$atagging
000002083 6531_ $$atag-side reconstruction
000002083 6531_ $$aFEI
000002083 6531_ $$aFull Event Interpretation
000002083 6531_ $$acalibration
000002083 700__ $$aFlorian Bernlochner
000002083 8560_ $$fwilliam.sutcliffe@desy.de
000002083 8564_ $$uhttps://docs.belle2.org/record/2083/files/BELLE2-CONF-PH-2020-019.pdf